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Acquisition - Allocation of Consideration Transferred for Crescendo (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Jun. 30, 2014 | Feb. 28, 2014
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Business Acquisition [Line Items] |  |  |
Goodwill | $ 169,181 us-gaap_Goodwill | $ 169,181 us-gaap_Goodwill |
Crescendo Biosciences, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Other assets acquired |  |  | 15,826 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets / us-gaap_BusinessAcquisitionAxis = mygn_CrescendoBioscienceIncMember
Intangible assets |  |  | 196,600 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = mygn_CrescendoBioscienceIncMember
Goodwill |  |  | 112,331 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = mygn_CrescendoBioscienceIncMember
Total assets acquired |  |  | 324,757 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = mygn_CrescendoBioscienceIncMember
Deferred tax liability |  |  | 44,213 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent / us-gaap_BusinessAcquisitionAxis = mygn_CrescendoBioscienceIncMember
Other liabilities assumed |  |  | 21,594 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther / us-gaap_BusinessAcquisitionAxis = mygn_CrescendoBioscienceIncMember
Total net assets acquired |  |  | $ 258,950 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = mygn_CrescendoBioscienceIncMember

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